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Compliance arrives after the build
Teams design the product, then discover what KYC, AML and data-residency rules require. Retrofitting an audit trail into a system that was not designed for one is close to a rewrite.
ThinkDebug
Practical deep dives on software architecture, AI systems, and scaling digital products - drawn from the work we ship.
Payments, lending, wealth and banking platforms built for the day an auditor asks how it works.
We build the software financial businesses run on: payment and wallet flows, lending and credit platforms, wealth and investment tools, and the integration layers that connect them to a core banking system you are not about to replace.
What separates this from ordinary product work is the cost of being wrong. In most applications a failed request is a retry. In a payments flow it is a reconciliation break, a support ticket, and a question from your auditor months later. So correctness comes before throughput: operations that are safe to repeat, a double-entry ledger as the single source of truth, and an audit trail recorded as a feature rather than left to log files.
We work with startups going to market for the first time and with institutions modernising systems they cannot switch off. Almost every engagement includes at least one integration with something older and less forgiving than the product being built, and that is usually where the real work sits.
The constraints that shape every build in this sector, and the ones teams usually meet too late.
Teams design the product, then discover what KYC, AML and data-residency rules require. Retrofitting an audit trail into a system that was not designed for one is close to a rewrite.
Money moves through several systems that each hold an opinion about the balance. Without a single source of truth and idempotent operations, the discrepancy is found by a customer rather than by you.
The system of record is decades old, undocumented and business-critical. Anything new has to work alongside it rather than instead of it.
A vulnerability in most products is a bug. In fintech it is a disclosure obligation, a partner-bank conversation and a headline.
Bank certification, gateway approval and partner sandboxes run on their calendar. A plan that assumes otherwise slips.
KYC is legally required and commercially expensive. Every additional field costs conversions, and the balance has to be designed rather than accepted.
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Each one is a system we have built before, not a capability we are willing to try.
Collection, payout and wallet flows across multiple gateways, with idempotency, retries, refunds and settlement reporting handled as core requirements rather than edge cases.
Customer-facing banking on top of a core you are keeping, with the integration layer, caching and failure handling that makes an old system usable.
Origination, underwriting workflows, disbursement and collections, with decisioning that can be explained to a regulator rather than only to a data scientist.
Portfolio, order and reporting systems where the arithmetic is expected to be exactly right and reproducible on demand.
Identity verification, document capture, sanctions screening and risk scoring, designed so the compliant path is also the fastest one to complete.
Double-entry ledgers, immutable transaction history and automated reconciliation against gateway and bank statements.
Engagements across sectors - the same team, the same standards.
Partnering with Thinkdebug to develop the Forever 52 mobile app has been a game-changer for us. They were always open to feedback, and it was clear they were as invested in our success as we were. What really sets them apart, though, is the amazing support we've received since the app launched. They’ve made sure the app continues to run smoothly and are always ready to fix any issues that come up.DMDhruv MehtaBusiness Head, Forever 52
Chosen for fit and long-term maintainability, never for novelty.
Send us the scope and we come back with an itemised estimate - no discovery fee, no obligation.
What we design and document against, from the first commit rather than the week before an audit.
Certification itself belongs to your entity and its assessor. What we provide is software built and documented so the assessment is about evidence rather than remediation.
Most of our work comes from clients we already shipped for. These are the reasons they give.
Every state change is recorded with actor, timestamp and reason, because adding that later means rewriting the parts that matter most.
Payment operations are designed to be safely repeatable, so a network timeout is a retry rather than a double charge.
The people who scope your platform build it. In a domain where a mistake is a regulatory event, that is not a staffing preference.
Architecture decisions, data flows and controls written down as part of delivery, not reconstructed under audit pressure.
Wrapping and strangling rather than demanding a replacement, so modernisation does not start with an outage.
Threat modelling at design time and a security review before launch, by engineers who also do this as a standalone service.
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Ask an engineerWhat we build for fintech, the work we have shipped, and what we have written about it.
